Mylenated nerve fibers are NOT a cause of poor vision. Does NOT require any treatment. A different cause for reduced vision would need to be found. Overwhelmingly the most common cause of good near vision but bad distance vision is MYOPIA (near-sighted) and glasses should take care of that problem. You can post the picture or put a link to it. But again that could NOT cause reduced central vision. Very common finding and not cause problems.
Thank you Doctor for your advice. I will try to get you high quality pictures from Cambodia tomrrow. We will also take your advice to show her to an eye MD ophthmologist. It is hard to find good Doctors in Cambodia but we will surely try.
Do the best you can. Important to protect the good eye from injury (consider wearing glasses for protection) and avoid high eye injury activities and wear activity appropriate eye protection. Also healthy lifestyle (don't smoke, don't get obese, good diet, exercise, etc).